[PATCH] D31721: Add __ffssi2 implementation to compiler-rt builtins

[Dimitry Andric via Phabricator via llvm-commits]

dim created this revision.
Herald added subscribers: mgorny, dberris.

During MIPS implementation work for FreeBSD, John Baldwin (jhb at FreeBSD.org)
found that gcc 6.x emits calls to __ffssi2() when compiling libc and some
userland programs in the base system.

He added it to compiler-rt's builtins, based off of the existing __ffsdi2()
implementation in https://reviews.freebsd.org/rS316511 .

I promised to submit this upstream, so here it is, including CMake updates and a
test case.  Is anything else required?


https://reviews.llvm.org/D31721

Files:
  lib/builtins/CMakeLists.txt
  lib/builtins/README.txt
  lib/builtins/ffssi2.c
  test/builtins/Unit/ffssi2_test.c

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